The Investigation of Ultic Horizon on Andisols Derived from the Eruption of Mount Tilu (Pleistocene, Basaltic) in West Java, Indonesia

DOI:10.17014/ijog.9.2.159-172 Ultic is the so il characteristics in soil taxonomy when argillic or kandic horizon found within depth of 125 cm with base saturation less than 35 % on overall upper 50 cm. The purpose this research to investigate whether ultic was developing from Pleistocene eruption Mount Tilu (basaltic parent materials), West Java, Indonesia. method used descriptive and comparative surveys three profiles area around Tilu, including investigation andic properties formation horizon. result showed that soils fulfilled requirements be classified as Andisols. Soil never dried for ninety days cumulative (udic) Udands. There were Fulvudands Hapludands location. Accumulation clays more 1.2% higher overlying at 90, 79, 51 those profiles. Base ranged 1.07 6.86 cmol kg -1 %, making Hapludands. high rainfall tropics age led leaching a long period form influence rain stronger basaltic materials forming Basaltic material not strong enough produce %.